In　order　to　investigate　the　feasibility　and　validity　of　using　fuzzy-control　strategy　for　nitrogen　removal　of　saline　sewage　in　the　sequence　batch　reactor　(SBR)　process,　the　real　saline　sewage　was　treated　firstly　in　this　experiment　and　the　variation　patterns　of　dissolved　oxygen　(DO)　and　pH　value　during　the　removal　of　organic　matter,　nitrification　and　denitrification　were　studied　in　detail　with　fresh　sewage　and　saline　sewage　at　salinity　10　g·L-1,　20　g　g·L-1,　35　g　g·L-1　during　steady　state　and　salinity　shock　periods.　The　results　showed　that　the　characteristic　points　and　platforms　of　pH　value　detected　in　saline　sewage　were　repeated　very　well　and　had　the　same　regularity　but　DO　curve　changed　a　lot　with　different　regularities.　The　characteristic　points　a　(break　point),　b　(ammonia　valley),　c　(nitrate　apex)could　indicate　the　completion　of　organic　matter　degradation,　nitrification　and　denitrification.　Points　a　and　b　would　appear　late　in　the　sewage　with　a　high　salinity.　During　the　salinity　shock　periods,　the　pH　value　also　changed　with　the　same　regularity　though　the　characteristic　points　appeared　in　different　times.　However,　when　the　salinity　was　above　30　g　g·L-1　the　pH　curve　became　flat.　Points　a　and　b　would　not　appear　until　the　aeration　time　was　prolonged　but　c　was　influenced　little.　Because　during　the　shock　periods　the　nitrification　oxidation　bacteria　were　inhibited　at　first,　then　were　ammonia　oxidation　bacteria,　and　the　denitrification　bacteria　were　inhibited　at　last.　pH　should　be　used　as　the　fuzzy-control　parameter　for　nitrogen　removal　of　saline　sewage　in　sequence　batch　reactor　(SBR)　process.